Here's what we're going with. Seems to work OK...
Type t =
Type.GetTypeFromProgID("WindowsInstaller.Installer");
Installer iInstaller =
(Installer)Activator.CreateInstance(t);
string strPatchPath = null;
string strPatchCode = null;
string strProdCode = null;
string strPatchXML = null;
XmlDocument xmlMsiPatch = new XmlDocument();
if (MinMsiVersion >
Convert.ToDouble(iInstaller.Version.Substring(0,
iInstaller.Version.IndexOf('.'))))
{
MessageBox.Show("Minimum Windows Installer version " +
MinMsiVersion + " required. Current version is " + iInstaller.Version,
"Windows Installer version problem...");
}
strPatchPath = "<patch to .msp>";
strPatchXML = iInstaller.ExtractPatchXMLData(strPatchPath);
xmlMsiPatch.LoadXml(strPatchXML);
strPatchCode =
xmlMsiPatch.DocumentElement.Attributes["PatchGUID"].Value;
strProdCode =
xmlMsiPatch.GetElementsByTagName("TargetProductCode").Item(0).InnerText;
//Now check if patch is applied...
int rtn = 0;
dynamic ePatch = iInstaller.get_Patches(strProdCode);
if (ePatch.count > 0)
{
for (var i = 0; i < ePatch.count; i++)
{
if (ePatch[i] == strPatchCode)
{
MessageBox.Show("here");
rtn = 1;
}
}
}
Hope this helps someone!
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